It may b a malware attacking ur norton product.Pls try this
Download malwarebytes from http://www.malwarebytes.org/ and install it and update it
Do a quick scan and remove the infections, reboot
Report if it solved ur problem.
i too have vista sp1 with nav 09 but in product tamper history i never got any such report ever.
I don't think its common thing on vista
Hmm, this is strange too, is it maybe my computer, because when I used your program it gave me the same message, Perhaps its just when I run a program as an administrator?
Yes, it does occur when you run with admin privileges, if you want to avoid it in your logs sign in as a standard user.